Tricia Compas-Markman was in Haiti after a devastating earthquake killed more than 160,000 people when she finally realised her idea to change the world was a winner. “Even after a year, people were still living in tents, still affected by cholera, still very much affected by the earthquake,” the engineer and entrepreneur recalled. The 31-year-old American travelled to the Caribbean nation in 2011 with relief groups and trained local communities to use an innovative bag she designed to collect, transport and treat drinking water in disaster zones.